From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Spring arrangements and experimental suggestions for the Tyre Pump Control mechanism.
| Identifier | ExFiles\Box 77\4\ scan0078 | |
| Date | 20th December 1928 | |
| X.4197 C To BY from DA.{Bernard Day - Chassis Design} Copy to HA (1 print). Copy to MS (1 print). Copy to Mott print. Copy to EFC. X.4197 Re R.R. Tyre Pump Control. RECEIVED! It has been pointed out to us that the springs in the control wire shewn on our drawing "R" Scheme 636 do not admit of the ring being placed on the hook when the gears fail to mesh. With the arrangement shewn it would be necessary to pull at the hook whilst turning the engine over, by means of the power starter. In order to confirm with Mr Royce's suggestion we should be glad if you could have the arrangement fitted up with the following springs:- A spring on the pump control lever to hold the gears in disengagement, with a pull of 1 pound, and to exert a pull of about 4 pounds when the gear is engaged. The spring in the control wire to give a pull of 7 pounds when deflected .2" and to give 24 pounds when deflected .650". This would mean that the gear is held in engagement by a force of 3 pounds, and when the teeth failed to mesh the operator would have to exert a pull of 24 1/2 pounds to place the ring on the peg. We suggest that these springs be experimented with to arrive at the best combination. DA.{Bernard Day - Chassis Design} | ||